Abstract: A display may have a pixel array such as a liquid crystal pixel array. The pixel array may be illuminated by a backlight unit that includes an array of light-emitting diodes. A backlight brightness selection circuit may select brightness values for the light-emitting diodes. The backlight brightness selection circuit may select the brightness values based on image data, based on brightness values used in previous image frames, based on device information, and/or based on sensor information. The backlight brightness selection circuit may select the backlight brightness levels to mitigate visible artifacts such as flickering and halo. The backlight levels selected by the backlight brightness selection may be modified by a power consumption compensation circuit. The power consumption compensation circuit may estimate the amount of power consumption required to operate the backlight using the target brightness levels and may modify the target brightness levels to meet maximum power consumption requirements.

Abstract: A display may have an active area that includes display pixels. The display may include an inactive notch region that extends into the active area. Data lines may provide image data from display driver circuitry to the display pixels. The image data may include data signals that correspond to portions of the display that do not include pixels, such as the inactive notch region. The null data signals may cause nonuniformities in the displayed image. The null data signals may be adjusted to minimize the nonuniformities. Null data signals corresponding to the inactive notch region may be adjusted to have gray levels that gradually decrease with distance from the border between the inactive notch and the active area. All of the data signals corresponding to the inactive notch may be set to a uniform gray level.

Abstract: A display device may include a processor that may receive image data, such that the image data may include gray level data and display brightness value (DBV) data for a first pixel of a display. The processor may then determine a gain compensation factor associated with the first pixel based on a correction spatial map, a brightness adaptation lookup table (LUT), the gray level data, and the DBV data. The processor may then determine an offset compensation factor associated with the first pixel based on the correction spatial map, the brightness adaptation lookup table (LUT), the gray level data, and the DBV data. The processor may generate compensated gray level data by applying the gain compensation factor and the offset compensation factor to the gray level data and transmit the compensated gray level data to pixel driving circuitry associated with the first pixel.

Abstract: A thin film transistor (TFT) backplane comprising a plurality of electrodes. Each of the plurality of electrodes is coupled to circuitry comprising: a first thin film transistor (TFT) coupled to the electrode for transmitting waveforms to the electrode, and a second TFT coupled to the electrode for discharging remnant charges from the electrode, wherein the second TFT is activated subsequent to the first TFT being deactivated.

Abstract: A display device may include rows of pixels that display image data on a display and a circuit. The circuit may receive pixel data value of image data for a pixel in a first row of the rows of pixels, determine a weight factor to apply to the pixel data value based on a position of the first row with respect to the other rows, such that each row is associated with a current-resistance (IR) drop across the display. The weight factor is determined based on a respective IR drop associated with the first row. The circuit may also generate a weighted pixel data value based on the weight factor and the pixel data value and send the weighted pixel data value to a display driver circuit that renders the image data via the display.

Abstract: A display may have a pixel array such as a liquid crystal pixel array. The pixel array may be illuminated by a backlight unit that includes an array of light-emitting diodes. A backlight brightness selection circuit may select brightness values for the light-emitting diodes. The backlight brightness selection circuit may select the brightness values based on image data, based on brightness values used in previous image frames, based on device information, and/or based on sensor information. The backlight brightness selection circuit may select the backlight brightness levels to mitigate visible artifacts such as flickering and halo. The backlight levels selected by the backlight brightness selection may be modified by a power consumption compensation circuit. The power consumption compensation circuit may estimate the amount of power consumption required to operate the backlight using the target brightness levels and may modify the target brightness levels to meet maximum power consumption requirements.

Abstract: A display may have an active area that includes display pixels. The display may include an inactive notch region that extends into the active area. Data lines may provide image data from display driver circuitry to the display pixels. The image data may include data signals that correspond to portions of the display that do not include pixels, such as the inactive notch region. The null data signals may cause nonuniformities in the displayed image. The null data signals may be adjusted to minimize the nonuniformities. Null data signals corresponding to the inactive notch region may be adjusted to have gray levels that gradually decrease with distance from the border between the inactive notch and the active area. All of the data signals corresponding to the inactive notch may be set to a uniform gray level.

Abstract: A display may have an array of pixels. Due to the presence of a notch in the display, the display may have some rows that are shorter than other rows in the display, and accordingly different gate line loading. To account for the gate line loading variations, the display driver circuitry may have gate driver circuits that provide different gate line signals to different rows of pixels within the display. In other arrangement, luminance adjustment circuitry may receive image data and generate corresponding compensated image data to account for gate line loading variations between rows of pixels in the display. The image data may be compensated based on the location of the pixel, the gray level of the image data, the display brightness, and/or temperature.

Abstract: A display may have a pixel array such as a liquid crystal pixel array. The pixel array may be illuminated by a backlight unit that includes an array of light-emitting diodes. A backlight brightness selection circuit may select brightness values for the light-emitting diodes. The backlight brightness selection circuit may select the brightness values based on image data, based on brightness values used in previous image frames, based on device information, and/or based on sensor information. The backlight brightness selection circuit may select the backlight brightness levels to mitigate visible artifacts such as flickering and halo. The backlight levels selected by the backlight brightness selection may be modified by a power consumption compensation circuit. The power consumption compensation circuit may estimate the amount of power consumption required to operate the backlight using the target brightness levels and may modify the target brightness levels to meet maximum power consumption requirements.

Abstract: An electro-optic display having an electrophoretic material configured for displaying images, and an active component coupled to the electrophoretic material for discharging charges within the electrophoretic material.

Abstract: A display may have a pixel array such as a liquid crystal pixel array. The pixel array may be illuminated by a backlight unit that includes an array of light-emitting diodes. A backlight brightness selection circuit may select brightness values for the light-emitting diodes. The backlight brightness selection circuit may select the brightness values based on image data, based on brightness values used in previous image frames, based on device information, and/or based on sensor information. The backlight brightness selection circuit may select the backlight brightness levels to mitigate visible artifacts such as flickering and halo. The backlight levels selected by the backlight brightness selection may be modified by a power consumption compensation circuit. The power consumption compensation circuit may estimate the amount of power consumption required to operate the backlight using the target brightness levels and may modify the target brightness levels to meet maximum power consumption requirements.

Abstract: Electro-optic displays with reduced remnant voltage, and related apparatus and methods are provided. A remnant voltage of a pixel of an electro-optic display may be discharged by activating the pixel's transistor and setting the voltages of the front and rear electrodes of the pixel to approximately the same voltage for a specified period of time, and/or until the amount of remnant voltage remaining in the pixel is less than a threshold amount. The remnant voltages of substantially all pixels or a subset of pixels in an active matrix electro-optic display may be simultaneously discharged. The simultaneous discharge of the remnant voltages of pixels may take place when the pixels are in a same state, characterized by (1) the transistor of each pixel being active, and (2) the voltages applied to the front and rear electrodes of each pixel being approximately equal.

Abstract: A display device may include a processor that may receive image data, such that the image data may include gray level data and display brightness value (DBV) data for a first pixel of a display. The processor may then determine a gain compensation factor associated with the first pixel based on a correction spatial map, a brightness adaptation lookup table (LUT), the gray level data, and the DBV data. The processor may then determine an offset compensation factor associated with the first pixel based on the correction spatial map, the brightness adaptation lookup table (LUT), the gray level data, and the DBV data. The processor may generate compensated gray level data by applying the gain compensation factor and the offset compensation factor to the gray level data and transmit the compensated gray level data to pixel driving circuitry associated with the first pixel.

Abstract: A display may have an active area that includes display pixels. The display may include an inactive notch region that extends into the active area. Data lines may provide image data from display driver circuitry to the display pixels. The image data may include data signals that correspond to portions of the display that do not include pixels, such as the inactive notch region. The null data signals may cause nonuniformities in the displayed image. The null data signals may be adjusted to minimize the nonuniformities. Null data signals corresponding to the inactive notch region may be adjusted to have gray levels that gradually decrease with distance from the border between the inactive notch and the active area. All of the data signals corresponding to the inactive notch may be set to a uniform gray level.

Abstract: This invention provides methods of and related apparatus for driving an electro-optic display having a plurality of pixels to display white text on a black background (“dark mode”) while reducing edge artifacts, ghosting and flashy updates. The present invention reduces the accumulation of edge artifacts by applying a special waveform transition to edge regions according to an algorithm along with methods to manage the DC imbalance introduced by the special transition. Edge artifact clearing may be achieved by identifying specific edge pixels to receive a special transition called an inverted top-off pulse (“iTop Pulse”) and, since the iTop Pulse is DC imbalanced, to subsequently discharge remnant voltage from the display.

Abstract: An electro-optic display having an electrophoretic material configured for displaying images, and an active component coupled to the electrophoretic material for discharging charges within the electrophoretic material.

Abstract: A driving method is provided for an electric-optic display having a plurality of display pixels, the method including dividing the plurality of display pixels into multiple groups of pixels, applying at least one waveform structure to the multiple groups of pixels, the at least one waveform structure having a driving section for updating the multiple groups of pixels, and updating the multiple groups of pixels in a contiguous fashion such that only one group of display pixels completes the driving section at any given time.

Abstract: There are provided display controllers and driving methods related to those described in US Published Patent Application No. 2013/0194250.

Abstract: Techniques for operating an electro-optic display to reduce the appearance of light edge artifacts in displayed images are described. A method for operating the electro-optic display includes detecting a null state transition of a first pixel when transitioning from a first image to a second image. The method further includes determining whether a threshold number of cardinal neighbors of the first pixel transition from a black state to a white state when transitioning from the first image to the second image. In response to a subsequent transition to a third image, the method further includes applying a voltage signal to the first pixel, wherein the voltage signal has a waveform configured to generate an optical black state for the first pixel.

Abstract: Electro-optic displays with reduced remnant voltage, and related apparatus and methods are provided. A remnant voltage of a pixel of an electro-optic display may be discharged by activating the pixel's transistor and setting the voltages of the front and rear electrodes of the pixel to approximately the same voltage for a specified period of time, and/or until the amount of remnant voltage remaining in the pixel is less than a threshold amount. The remnant voltages of substantially all pixels or a subset of pixels in an active matrix electro-optic display may be simultaneously discharged. The simultaneous discharge of the remnant voltages of pixels may take place when the pixels are in a same state, characterized by (1) the transistor of each pixel being active, and (2) the voltages applied to the front and rear electrodes of each pixel being approximately equal.